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Notice (8): SplFileObject::fwrite() [<a href='https://secure.php.net/splfileobject.fwrite'>splfileobject.fwrite</a>]: Write of 120 bytes failed with errno=28 No space left on device [CORE/src/Cache/Engine/FileEngine.php, line 141]

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php实现检查用户名是否已在mysql中存在 - 站长搜索
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php实现检查用户名是否已在mysql中存在

PHP 2014-12-01 07:46:46 转载来源: 网络整理/侵权必删

本文是一个php+mysql开发的入门教材:php实现检查用户名是否已在mysql中存在,感兴趣的同学参考下. 在写注册系统时,如果要检查用户名是否存在,php可以这样写: $username=$_REQUEST['username']; $password=$_REQUEST['password']; echo "<br/>excute the insertUserInfo"; $con=mysqli_connect("localhost","root","","my_db"); $sql="SELECT * FROM user WHERE username='$username'"; echo "<br/>this username aready exists"; } else { $sql="INSERT INTO use

本文是一个php+mysql开发的入门教材:php实现检查户名是否已在mysql中存在,感兴趣的同学参考下.


在写注册系统时,如果要检查用户名是否存在,php可以这样写:


$username=$_REQUEST['username'];
$password=$_REQUEST['password'];
echo "<br/>excute the insertUserInfo";
$con=mysqli_connect("localhost","root","","my_db");
$sql="SELECT * FROM user WHERE username='$username'";

echo "<br/>this username aready exists"; }
else { $sql="INSERT INTO user (username,password) VALUES ('$username','$password')";
if(!mysqli_query($con,$sql)) { echo "<br/>Error".mysqli_error($con); } else { echo "<br/>one record added"; } }


建议不要用:


mysql_num_rows($result)
 

标签: php 实现 检查 户名 是否 已在 mysql 存在


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